{"id":11677,"date":"2023-05-13T16:01:20","date_gmt":"2023-05-13T08:01:20","guid":{"rendered":"https:\/\/firstmold.com\/?p=11677"},"modified":"2025-07-15T13:33:26","modified_gmt":"2025-07-15T05:33:26","slug":"plastic-shrinkage","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pt\/guides\/plastic-shrinkage\/","title":{"rendered":"O que \u00e9 a contra\u00e7\u00e3o do pl\u00e1stico?"},"content":{"rendered":"<p>A retra\u00e7\u00e3o \u00e9 uma propriedade crucial dos pl\u00e1sticos, com impacto direto na moldagem dos produtos. Em <a href=\"https:\/\/firstmold.com\/pt\/guides\/what-is-an-injection-mold\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>molde de inje\u00e7\u00e3o de pl\u00e1stico<\/strong><\/a> e <a href=\"https:\/\/firstmold.com\/pt\/guides\/what-is-injection-molding\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>moldagem por inje\u00e7\u00e3o<\/strong><\/a> ind\u00fastrias, os projectistas devem compreender a retra\u00e7\u00e3o, uma vez que esta influencia a conce\u00e7\u00e3o do molde. <\/p>\n\n\n\n<p>Para os designers de produtos, embora n\u00e3o fabriquem diretamente artigos de pl\u00e1stico, \u00e9 vital compreender o encolhimento. Caso contr\u00e1rio, os seus projectos podem causar problemas desnecess\u00e1rios durante a produ\u00e7\u00e3o, especialmente com produtos de paredes mais espessas.<\/p>\n\n\n\n<p>Este artigo explora de forma exaustiva a contra\u00e7\u00e3o do pl\u00e1stico, oferecendo ideias para os projectistas de moldes e produtos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-plastic-shrinkage\">O que \u00e9 a contra\u00e7\u00e3o do pl\u00e1stico?<\/h2>\n\n\n\n<p>A contra\u00e7\u00e3o do pl\u00e1stico refere-se \u00e0 diminui\u00e7\u00e3o percentual das dimens\u00f5es desde o tamanho inicial, n\u00e3o arrefecido, at\u00e9 ao tamanho arrefecido, \u00e0 temperatura ambiente. N\u00e3o se deve apenas \u00e0 expans\u00e3o e contra\u00e7\u00e3o t\u00e9rmicas, mas est\u00e1 tamb\u00e9m relacionada com v\u00e1rios factores de moldagem, sendo por isso denominada contra\u00e7\u00e3o de moldagem.<\/p>\n\n\n\n<p>Especificamente, a retra\u00e7\u00e3o pode ser calculada atrav\u00e9s desta f\u00f3rmula: <\/p>\n\n\n\n<p><strong>Encolhimento = (Dimens\u00e3o original - Dimens\u00e3o arrefecida) \/ Dimens\u00e3o original \u00d7 100%<\/strong><\/p>\n\n\n\n<p>A extens\u00e3o da contra\u00e7\u00e3o do pl\u00e1stico depende de factores como o tipo de material, a composi\u00e7\u00e3o, a absor\u00e7\u00e3o de humidade e a temperatura do molde. Por exemplo, os pl\u00e1sticos cristalinos apresentam normalmente uma maior contra\u00e7\u00e3o do que os pl\u00e1sticos amorfos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-impact-of-shrinkage-on-parts\">O impacto da retra\u00e7\u00e3o nas pe\u00e7as<\/h3>\n\n\n\n<p>A retra\u00e7\u00e3o afecta as pe\u00e7as de v\u00e1rias formas, incluindo o desempenho do produto, o aspeto e os custos de produ\u00e7\u00e3o.<\/p>\n\n\n\n<p>Em primeiro lugar, diminui a precis\u00e3o dimensional da pe\u00e7a. Taxas de retra\u00e7\u00e3o mal controladas podem desviar as dimens\u00f5es das pe\u00e7as das especifica\u00e7\u00f5es do projeto, afectando a precis\u00e3o da montagem e o desempenho do encaixe. Na ind\u00fastria autom\u00f3vel, por exemplo, a retra\u00e7\u00e3o pode impedir o bom funcionamento de componentes como portas e janelas, afectando o desempenho geral e a seguran\u00e7a do ve\u00edculo.<\/p>\n\n\n\n<p>Em segundo lugar, influencia a qualidade do aspeto das pe\u00e7as. Como as pe\u00e7as de pl\u00e1stico t\u00eam normalmente superf\u00edcies lisas, a contra\u00e7\u00e3o pode causar irregularidades na superf\u00edcie, diminuindo a est\u00e9tica e a textura do produto. Isto n\u00e3o s\u00f3 afecta as decis\u00f5es de compra dos consumidores, como tamb\u00e9m prejudica a imagem de marca de uma empresa.<\/p>\n\n\n\n<p>Al\u00e9m disso, a contra\u00e7\u00e3o aumenta os custos de produ\u00e7\u00e3o. Para controlar as taxas de retra\u00e7\u00e3o, as empresas de moldagem por inje\u00e7\u00e3o t\u00eam de tomar v\u00e1rias medidas, tais como ajustar os desenhos dos moldes e otimizar os processos de moldagem por inje\u00e7\u00e3o. Estas medidas requerem recursos humanos e materiais significativos, aumentando os custos de produ\u00e7\u00e3o. Al\u00e9m disso, devido \u00e0 diminui\u00e7\u00e3o da precis\u00e3o dimensional das pe\u00e7as, as empresas podem necessitar de um processamento secund\u00e1rio ou de repara\u00e7\u00f5es, aumentando ainda mais os custos de produ\u00e7\u00e3o e de tempo.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-product-designers-need-to-know-injection-molding-shrinkage\">Porque \u00e9 que os designers de produtos precisam de conhecer a retra\u00e7\u00e3o da moldagem por inje\u00e7\u00e3o<\/h3>\n\n\n\n<p>Apesar de as f\u00e1bricas de moldagem por inje\u00e7\u00e3o resolverem os problemas de retra\u00e7\u00e3o durante a produ\u00e7\u00e3o, os designers de produtos continuam a ter de compreender os conhecimentos relacionados com a retra\u00e7\u00e3o. Eis porqu\u00ea:<\/p>\n\n\n\n<p><strong>Otimizar as concep\u00e7\u00f5es:<\/strong> A compreens\u00e3o do encolhimento permite aos designers antecipar as altera\u00e7\u00f5es de tamanho durante a produ\u00e7\u00e3o, optimizando os designs para obter resultados precisos e consistentes.<\/p>\n\n\n\n<p><strong>Sele\u00e7\u00e3o de materiais:<\/strong> Diferentes pl\u00e1sticos apresentam diferentes n\u00edveis de contra\u00e7\u00e3o durante a moldagem. O conhecimento da retra\u00e7\u00e3o ajuda a selecionar materiais adequados com base nos requisitos do projeto.<\/p>\n\n\n\n<p><strong>Processo de conce\u00e7\u00e3o iterativo:<\/strong> Antecipar e resolver os problemas de contra\u00e7\u00e3o numa fase precoce reduz os ciclos de desenvolvimento, acelerando o lan\u00e7amento de produtos.<\/p>\n\n\n\n<p><strong>Efici\u00eancia de custos:<\/strong> A minimiza\u00e7\u00e3o dos problemas relacionados com a contra\u00e7\u00e3o reduz o desperd\u00edcio, o retrabalho e os atrasos, aumentando a efici\u00eancia dos custos nos processos de produ\u00e7\u00e3o. Os projectistas conscientes da retra\u00e7\u00e3o podem criar produtos economicamente vi\u00e1veis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-factors-influencing-injection-molding-shrinkage\">Factores que influenciam a retra\u00e7\u00e3o da moldagem por inje\u00e7\u00e3o<\/h2>\n\n\n\n<p>As taxas de retra\u00e7\u00e3o variam entre os pl\u00e1sticos devido a factores como a espessura, os processos de moldagem e as condi\u00e7\u00f5es ambientais. Para os designers de produtos, \u00e9 crucial ter em conta que:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Paredes mais espessas levam a tempos de arrefecimento mais longos e a um maior encolhimento.<\/li>\n\n\n\n<li>Carater\u00edsticas como refor\u00e7os e grava\u00e7\u00f5es resistem ao encolhimento, resultando em taxas de encolhimento menores nestas \u00e1reas.<\/li>\n<\/ol>\n\n\n\n<p>Para os projectistas de moldes, deve ser prestada aten\u00e7\u00e3o \u00e0 forma como a retra\u00e7\u00e3o do pl\u00e1stico \u00e9 afetada, principalmente em:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-molding-processes-factor\">Fator de processos de moldagem<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A temperatura de moldagem consistente reduz o encolhimento.<\/li>\n\n\n\n<li>O aumento da press\u00e3o de inje\u00e7\u00e3o diminui o encolhimento.<\/li>\n\n\n\n<li>Uma temperatura de fus\u00e3o mais elevada reduz o encolhimento.<\/li>\n\n\n\n<li>Uma temperatura de molde mais elevada aumenta a contra\u00e7\u00e3o.<\/li>\n\n\n\n<li>A press\u00e3o prolongada mant\u00e9m a redu\u00e7\u00e3o do encolhimento.<\/li>\n\n\n\n<li>Um tempo de arrefecimento mais longo dentro do molde diminui o encolhimento.<\/li>\n\n\n\n<li>Velocidades de inje\u00e7\u00e3o elevadas aumentam ligeiramente o encolhimento.<\/li>\n\n\n\n<li>A retra\u00e7\u00e3o inicial \u00e9 grande, estabilizando ap\u00f3s cerca de dois dias.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-plastic-structure-factor\">Fator de estrutura pl\u00e1stica<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>As pe\u00e7as com paredes espessas apresentam taxas de contra\u00e7\u00e3o mais elevadas.<\/li>\n\n\n\n<li>Pe\u00e7as com <a href=\"https:\/\/firstmold.com\/pt\/guides\/mold-inserts\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>inser\u00e7\u00f5es<\/strong><\/a> t\u00eam taxas de retra\u00e7\u00e3o mais baixas.<\/li>\n\n\n\n<li>As formas complexas t\u00eam taxas de contra\u00e7\u00e3o menores.<\/li>\n\n\n\n<li>A retra\u00e7\u00e3o \u00e9 normalmente menor na dire\u00e7\u00e3o do fluxo.<\/li>\n\n\n\n<li>As pe\u00e7as alongadas apresentam um encolhimento menor ao longo do comprimento.<\/li>\n\n\n\n<li>O encolhimento ao longo do comprimento \u00e9 menor do que a espessura.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mold-structure-factor\">Fator de estrutura do molde<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>O tamanho maior do port\u00e3o reduz o encolhimento.<\/li>\n\n\n\n<li>As pe\u00e7as mais afastadas do port\u00e3o t\u00eam um encolhimento menor.<\/li>\n\n\n\n<li>Partes restritas do molde apresentam menor retra\u00e7\u00e3o.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-plastic-properties-factor\">Fator de propriedades pl\u00e1sticas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Os pl\u00e1sticos cristalinos apresentam maior retra\u00e7\u00e3o do que os amorfos.<\/li>\n\n\n\n<li>Os pl\u00e1sticos com boa fluidez t\u00eam uma contra\u00e7\u00e3o de moldagem menor.<\/li>\n\n\n\n<li>A adi\u00e7\u00e3o de cargas aos pl\u00e1sticos reduz significativamente a contra\u00e7\u00e3o.<\/li>\n\n\n\n<li>Diferentes lotes do mesmo pl\u00e1stico apresentam taxas de retra\u00e7\u00e3o diferentes.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-various-materials-exhibit-different-shrinkage-in-injection-molding\">V\u00e1rios materiais apresentam diferentes retrac\u00e7\u00f5es na moldagem por inje\u00e7\u00e3o<\/h2>\n\n\n\n<p>Devido \u00e0 multiplicidade de factores que influenciam as taxas de retra\u00e7\u00e3o dos pl\u00e1sticos, os valores apresentam uma gama consider\u00e1vel de flutua\u00e7\u00f5es. Por exemplo, a taxa de encolhimento do ABS que voc\u00ea pode encontrar on-line pode ser de aproximadamente 0,4% a 0,7%. Para fornecer um intervalo mais preciso, a FirstMold compilou v\u00e1rias tabelas detalhadas de taxas de encolhimento de pl\u00e1stico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pa6-plastic-shrinkage\">PA6 Encolhimento do pl\u00e1stico:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>15% PA6 refor\u00e7ado com fibra de vidro<\/td><td>0.5-0.8<\/td><td>PA6G15<\/td><\/tr><tr><td>20% PA6 refor\u00e7ado com fibra de vidro<\/td><td>0.4-0.6<\/td><td>PA6G20<\/td><\/tr><tr><td>30% PA6 refor\u00e7ado com fibra de vidro<\/td><td>0.3-0.5<\/td><td>PA6G30<\/td><\/tr><tr><td>40% PA6 refor\u00e7ado com fibra de vidro<\/td><td>0.1-0.3<\/td><td>PA6G40<\/td><\/tr><tr><td>50% PA6 refor\u00e7ado com fibra de vidro<\/td><td>0.1-0.3<\/td><td>PA6G50<\/td><\/tr><tr><td>25% PA6 retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PA6G25<\/td><\/tr><tr><td>30% PA6 retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PA6G30<\/td><\/tr><tr><td>30% PA6 retardador de chama sem halog\u00e9neo, refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PA6G30<\/td><\/tr><tr><td>PA6 retardador de chama sem halog\u00e9neo<\/td><td>0.8-1.2<\/td><td>Z-PA6<\/td><\/tr><tr><td>30% PA6 retardador de chama sem halog\u00e9neo, com enchimento mineral<\/td><td>0.5-0.8<\/td><td>Z-PA6M30<\/td><\/tr><tr><td>30% Microesfera de vidro preenchida com PA6<\/td><td>0.8-1.2<\/td><td>PA6M30<\/td><\/tr><tr><td>30% Comp\u00f3sito mineral de fibra de vidro preenchido com PA6<\/td><td>0.3-0.5<\/td><td>PA6M30<\/td><\/tr><tr><td>40% Comp\u00f3sito mineral de fibra de vidro preenchido com PA6<\/td><td>0.2-0.5<\/td><td>PA6M40<\/td><\/tr><tr><td>30% PA6 com enchimento mineral<\/td><td>0.6-0.9<\/td><td>PA6M30<\/td><\/tr><tr><td>40% PA6 com enchimento mineral<\/td><td>0.4-0.7<\/td><td>PA6M40<\/td><\/tr><tr><td>Grau de inje\u00e7\u00e3o geral PA6<\/td><td>1.4-1.8<\/td><td>PA6<\/td><\/tr><tr><td>Prototipagem r\u00e1pida PA6<\/td><td>1.2-1.6<\/td><td>PA6<\/td><\/tr><tr><td>PA6 temperado geral<\/td><td>1.0-1.5<\/td><td>PA6<\/td><\/tr><tr><td>PA6 de dureza m\u00e9dia<\/td><td>0.9-1.3<\/td><td>PA6<\/td><\/tr><tr><td>PA6 super-resistente<\/td><td>0.9-1.3<\/td><td>PA6<\/td><\/tr><tr><td>PA6 resistente ao desgaste com enchimento de MoS2<\/td><td>1.0-1.4<\/td><td>PA6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pa6-plastic-shrinkage-0\">PA6 Encolhimento do pl\u00e1stico:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>15% PA66 refor\u00e7ado com fibra de vidro<\/td><td>0.6-0.9<\/td><td>PA66G15<\/td><\/tr><tr><td>20% PA66 refor\u00e7ado com fibra de vidro<\/td><td>0.5-0.8<\/td><td>PA66G20<\/td><\/tr><tr><td>25% \u00d3leo resistente ao calor refor\u00e7ado com fibra de vidro PA66<\/td><td>0.4-0.7<\/td><td>PA66G25<\/td><\/tr><tr><td>30% PA66 refor\u00e7ado com fibra de vidro<\/td><td>0.4-0.7<\/td><td>PA66G30<\/td><\/tr><tr><td>30% PA66 resistente \u00e0 hidr\u00f3lise refor\u00e7ado com fibra de vidro<\/td><td>0.3-0.6<\/td><td>PA66G30<\/td><\/tr><tr><td>40% PA66 refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.5<\/td><td>PA66G40<\/td><\/tr><tr><td>50% PA66 refor\u00e7ado com fibra de vidro<\/td><td>0.1-0.3<\/td><td>PA66G50<\/td><\/tr><tr><td>25% PA66 retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PA66G25<\/td><\/tr><tr><td>30% PA66 retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PA66G30<\/td><\/tr><tr><td>30% Retardador de chama sem halog\u00e9neo, com enchimento mineral PA66<\/td><td>0.2-0.4<\/td><td>PA66M30<\/td><\/tr><tr><td>Retardador de chama sem halog\u00e9neo PA66<\/td><td>0.8-1.2<\/td><td>Z-PA66<\/td><\/tr><tr><td>30% Retardador de chama sem halog\u00e9neo, com enchimento mineral PA66<\/td><td>0.4-0.7<\/td><td>Z-PA66M30<\/td><\/tr><tr><td>30% Microesfera de vidro preenchida com PA66<\/td><td>0.8-1.2<\/td><td>PA66M30<\/td><\/tr><tr><td>30% Comp\u00f3sito mineral de fibra de vidro preenchido com PA66<\/td><td>0.2-0.5<\/td><td>PA66M30<\/td><\/tr><tr><td>30% Enchimento mineral PA66<\/td><td>0.6-0.9<\/td><td>PA66M30<\/td><\/tr><tr><td>40% PA66 com enchimento mineral<\/td><td>0.4-0.7<\/td><td>PA66M40<\/td><\/tr><tr><td>Grau de inje\u00e7\u00e3o geral PA66<\/td><td>1.5-1.8<\/td><td>PA66<\/td><\/tr><tr><td>Prototipagem r\u00e1pida PA66<\/td><td>1.5-1.8<\/td><td>PA66<\/td><\/tr><tr><td>PA66 temperado geral<\/td><td>1.2-1.7<\/td><td>PA66<\/td><\/tr><tr><td>PA66 de dureza m\u00e9dia<\/td><td>1.2-1.6<\/td><td>PA66<\/td><\/tr><tr><td>PA66 super-resistente<\/td><td>1.2-1.6<\/td><td>PA66<\/td><\/tr><tr><td>PA66 resistente ao desgaste com enchimento de MoS2<\/td><td>1.2-1.6<\/td><td>PA66<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pp-plastic-shrinkage\">PP Encolhimento do pl\u00e1stico:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>20% PP com enchimento de talco<\/td><td>1.0-1.5<\/td><td>PPM20<\/td><\/tr><tr><td>30% PP com enchimento de talco<\/td><td>0.8-1.2<\/td><td>PPM30<\/td><\/tr><tr><td>40% PP com enchimento de talco<\/td><td>0.8-1.0<\/td><td>PPM40<\/td><\/tr><tr><td>20% PP temperado com enchimento de talco<\/td><td>1.0-1.2<\/td><td>PPM20<\/td><\/tr><tr><td>20% PP com enchimento de carbonato de c\u00e1lcio<\/td><td>1.2-1.6<\/td><td>PPM20<\/td><\/tr><tr><td>10% PP refor\u00e7ado com fibra de vidro<\/td><td>0.7-1.0<\/td><td>PPG10<\/td><\/tr><tr><td>20% PP refor\u00e7ado com fibra de vidro<\/td><td>0.5-0.8<\/td><td>PPG20<\/td><\/tr><tr><td>30% PP refor\u00e7ado com fibra de vidro<\/td><td>0.4-0.7<\/td><td>PPG30<\/td><\/tr><tr><td>20% Microesfera de vidro preenchida com PP<\/td><td>1.2-1.6<\/td><td>PPM20<\/td><\/tr><tr><td>30% Microesfera de vidro preenchida com PP<\/td><td>1.0-1.2<\/td><td>PPM20<\/td><\/tr><tr><td>PP retardador de chama bromado<\/td><td>1.5-1.8<\/td><td>PP<\/td><\/tr><tr><td>PP retardador de chama sem halog\u00e9neo<\/td><td>1.3-1.6<\/td><td>PP<\/td><\/tr><tr><td>PP de alto fluxo e alto impacto<\/td><td>1.5-2.0<\/td><td>PP<\/td><\/tr><tr><td>PP temperado geral<\/td><td>1.5-2.0<\/td><td>PP<\/td><\/tr><tr><td>PP temperado m\u00e9dio<\/td><td>1.4-1.9<\/td><td>PP<\/td><\/tr><tr><td>PP super-resistente<\/td><td>1.3-1.8<\/td><td>PP<\/td><\/tr><tr><td>PP1 resistente ao envelhecimento por calor<\/td><td>1.5-2.0<\/td><td>PP1<\/td><\/tr><tr><td>PP2 resistente ao envelhecimento por calor<\/td><td>1.5-2.0<\/td><td>PP2<\/td><\/tr><tr><td>PP3 resistente ao envelhecimento por calor<\/td><td>1.5-2.0<\/td><td>PP3<\/td><\/tr><tr><td>Resist\u00eancia ao impacto Resist\u00eancia \u00e0s intemp\u00e9ries PP4<\/td><td>1.5-2.0<\/td><td>PP4<\/td><\/tr><tr><td>PP5 resistente a intemp\u00e9ries de alto impacto<\/td><td>1.5-1.8<\/td><td>PP5<\/td><\/tr><tr><td>20% PP6 com enchimento de talco<\/td><td>1.0-1.2<\/td><td>PP6<\/td><\/tr><tr><td>30% PP7 com enchimento de talco<\/td><td>0.9-1.1<\/td><td>PP7<\/td><\/tr><tr><td>40% PP8 com enchimento de talco<\/td><td>0.8-1.0<\/td><td>PP8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pc-plastic-shrinkage\">PC Encolhimento do pl\u00e1stico:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>10% PC refor\u00e7ado com fibra de vidro<\/td><td>0.3-0.5<\/td><td>PCG10<\/td><\/tr><tr><td>20% PC refor\u00e7ado com fibra de vidro<\/td><td>0.3-0.5<\/td><td>PCG20<\/td><\/tr><tr><td>25% PC refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>PCG25<\/td><\/tr><tr><td>30% PC refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>PCG30<\/td><\/tr><tr><td>20% PC retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PCG20<\/td><\/tr><tr><td>25% PC retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PCG25<\/td><\/tr><tr><td>30% PC retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PCG30<\/td><\/tr><tr><td>20% PC retardador de chama sem halog\u00e9neo, refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>Z-PCG20<\/td><\/tr><tr><td>30% PC retardador de chama sem halog\u00e9neo, refor\u00e7ado com fibra de vidro<\/td><td>0.1-0.3<\/td><td>Z-PCG30<\/td><\/tr><tr><td>20% PC preenchido com microesferas de vidro<\/td><td>0.3-0.6<\/td><td>PCM20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pc-abs-plastic-shrinkage\">PC\/ABS Encolhimento do pl\u00e1stico:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>20% PC\/ABS refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>PC\/ABSG20<\/td><\/tr><tr><td>PC\/ABS retardador de chama bromado<\/td><td>0.3-0.6<\/td><td>Z-PC\/ABS<\/td><\/tr><tr><td>PC\/ABS retardador de chama sem halog\u00e9neo<\/td><td>0.4-0.7<\/td><td>Z-PC\/ABS<\/td><\/tr><tr><td>PC\/ABS resistente \u00e0s intemp\u00e9ries<\/td><td>0.4-0.7<\/td><td>PC\/ABS<\/td><\/tr><tr><td>35% PC<\/td><td>0.4-0.6<\/td><td>PC\/ABS<\/td><\/tr><tr><td>65% PC<\/td><td>0.4-0.7<\/td><td>PC\/ABS<\/td><\/tr><tr><td>85% PC<\/td><td>0.4-0.7<\/td><td>PC\/ABS<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pc-pbt-plastic-shrinkage\">PC\/PBT Encolhimento do pl\u00e1stico:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>10% PC\/PBT refor\u00e7ado com fibra de vidro<\/td><td>0.5-0.8<\/td><td>PC\/PBTG10<\/td><\/tr><tr><td>20% PC\/PBT refor\u00e7ado com fibra de vidro<\/td><td>0.4-0.6<\/td><td>PC\/PBTG20<\/td><\/tr><tr><td>30% PC\/PBT refor\u00e7ado com fibra de vidro<\/td><td>0.3-0.5<\/td><td>PC\/PBTG30<\/td><\/tr><tr><td>30% PC\/PBT resistente ao calor, refor\u00e7ado com fibra de vidro e retardador de chama<\/td><td>0.3-0.5<\/td><td>Z-PC\/PBTG30<\/td><\/tr><tr><td>PC\/PBT de alto impacto e resistente ao calor<\/td><td>0.6-1.0<\/td><td>PC\/PBT<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-abs-plastic-shrinkage\">Pl\u00e1stico ABS Encolhimento:<\/h3>\n\n\n\n<p>Eis o quadro baseado nas informa\u00e7\u00f5es fornecidas:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Material e descri\u00e7\u00e3o<\/th><th>Contra\u00e7\u00e3o do molde (%)<\/th><th>Observa\u00e7\u00f5es<\/th><\/tr><\/thead><tbody><tr><td>20% ABS refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>ABSG20<\/td><\/tr><tr><td>25% ABS refor\u00e7ado com fibra de vidro<\/td><td>0.2-0.4<\/td><td>ABSG25<\/td><\/tr><tr><td>30% ABS refor\u00e7ado com fibra de vidro<\/td><td>0.1-0.3<\/td><td>ABSG30<\/td><\/tr><tr><td>20% ABS retardador de chama refor\u00e7ado com fibra de vidro<\/td><td>0.1-0.3<\/td><td>Z-ABSG20<\/td><\/tr><tr><td>ABS de grau geral retardador de chama<\/td><td>0.4-0.7<\/td><td>Z-ABS<\/td><\/tr><tr><td>ABS de grau de inje\u00e7\u00e3o geral<\/td><td>0.4-0.7<\/td><td>ABS<\/td><\/tr><tr><td>ABS de grau resistente \u00e0s intemp\u00e9ries<\/td><td>0.4-0.7<\/td><td>ABS<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-prevent-fluctuations-in-plastic-shrinkage\">Como evitar flutua\u00e7\u00f5es na contra\u00e7\u00e3o do pl\u00e1stico?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-measures-to-adopt\">Medidas a adotar<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-achieving-flow-and-gate-balance\">Alcan\u00e7ar o equil\u00edbrio do fluxo e do port\u00e3o<\/h4>\n\n\n\n<p>Tal como o t\u00edtulo menciona, as taxas de contra\u00e7\u00e3o variam devido a altera\u00e7\u00f5es na press\u00e3o da resina. No caso de moldes de cavidade \u00fanica com m\u00faltiplas comportas ou moldes de m\u00faltiplas cavidades, \u00e9 essencial um equil\u00edbrio correto das comportas. O equil\u00edbrio das comportas \u00e9 necess\u00e1rio para um fluxo uniforme de resina, que depende da resist\u00eancia ao fluxo dentro do canal. Por isso, \u00e9 prefer\u00edvel alcan\u00e7ar o equil\u00edbrio do canal antes do equil\u00edbrio das comportas.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-mold-cavity-arrangement\">Disposi\u00e7\u00e3o das cavidades do molde<\/h4>\n\n\n\n<p>Para facilitar a configura\u00e7\u00e3o das condi\u00e7\u00f5es de moldagem, deve prestar-se aten\u00e7\u00e3o \u00e0 disposi\u00e7\u00e3o das cavidades do molde. Uma vez que a resina fundida transporta calor para o molde, em disposi\u00e7\u00f5es t\u00edpicas das cavidades, a distribui\u00e7\u00e3o da temperatura do molde forma c\u00edrculos conc\u00eantricos centrados \u00e0 volta da porta. Por conseguinte, ao selecionar a disposi\u00e7\u00e3o das cavidades em moldes com v\u00e1rias cavidades, \u00e9 importante assegurar um equil\u00edbrio f\u00e1cil do corredor e uma disposi\u00e7\u00e3o conc\u00eantrica centrada em torno da porta.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-preventing-molding-deformation\">Prevenir a deforma\u00e7\u00e3o do molde<\/h4>\n\n\n\n<p>A deforma\u00e7\u00e3o do molde ocorre devido a uma contra\u00e7\u00e3o desigual que resulta em tens\u00e3o interna. Para evitar a contra\u00e7\u00e3o irregular, especialmente em casos como produtos circulares com orif\u00edcios no centro da engrenagem, deve ser colocada uma porta no centro. No entanto, quando existe uma diferen\u00e7a significativa nas taxas de retra\u00e7\u00e3o entre a dire\u00e7\u00e3o de fluxo da resina e a dire\u00e7\u00e3o perpendicular, surge a desvantagem de formar uma elipse. <\/p>\n\n\n\n<p>Para uma maior precis\u00e3o de arredondamento, \u00e9 necess\u00e1rio instalar portas de 3 ou 6 pontos. No entanto, \u00e9 crucial garantir o equil\u00edbrio correto de cada porta. Ao utilizar portas laterais, uma porta de 3 pontos pode alargar o di\u00e2metro interior de produtos cil\u00edndricos. Em situa\u00e7\u00f5es em que n\u00e3o s\u00e3o permitidas marcas de porta na superf\u00edcie e nas faces finais, \u00e9 aconselh\u00e1vel minimizar a utiliza\u00e7\u00e3o de portas multiponto laterais internas, que podem produzir resultados favor\u00e1veis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-nbsp\">&nbsp;<\/h3>","protected":false},"excerpt":{"rendered":"<p>A retra\u00e7\u00e3o do pl\u00e1stico tem um impacto na precis\u00e3o dimensional da moldagem por inje\u00e7\u00e3o. Obtenha a tabela completa de retra\u00e7\u00e3o do pl\u00e1stico aqui.<\/p>","protected":false},"author":5,"featured_media":11679,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[47],"tags":[54],"class_list":["post-11677","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides","tag-product-design"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is Plastic Shrinkage? | Plastic Shrinkage Chart<\/title>\n<meta name=\"description\" content=\"Understand shrinkage rates with First Mold. 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